6-Hydroxy-2-nitro-3-(trifluoromethoxy)pyridine-4-sulfonamide
3-(Difluoromethyl)-6-hydroxy-4-(trifluoromethoxy)pyridine-2-carboxylic acid
6-Hydroxy-3-nitro-2-(trifluoromethoxy)pyridine-4-carbonyl chloride
4-(Difluoromethyl)-5-hydroxy-3-(trifluoromethoxy)pyridine-2-carboxylic acid